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   源码介绍

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简单，适合新手

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.IO;

namespace tcpclient
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            FileDialog fDg = new OpenFileDialog();
            if (fDg.ShowDialog() == DialogResult.OK)
            {
                tcp4.SendFile(fDg.FileName);
            }
        }
        class tcp4
        {
            public static string curMsg = "";
            public static void SendFile(string fileName)
            {
                try
                {
                    IPAddress[] ipAddress = Dns.GetHostAddresses("localhost");
                    IPEndPoint ipEnd = new IPEndPoint(ipAddress[0], 5576);
                    Socket clientSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);


                    string filePath = "";

                    fileName = fileName.Replace("\\", "/");
                    while (fileName.IndexOf("/") > -1)
                    {
                        filePath  = fileName.Substring(0, fileName.IndexOf("/")   1);
                        fileName = fileName.Substring(fileName.IndexOf("/")   1);
                    }


                    byte[] fileNameByte = Encoding.GetEncoding("GB2312").GetBytes(fileName);
                    if (fileNameByte.Length > 850 * 1024)
                    {
                        curMsg = "文件大小超过 850kb, 请选择更小的文件.";
                        return;
                    }

                    curMsg = "缓冲中...";
                    byte[] fileData = File.ReadAllBytes(filePath   fileName);
                    byte[] clientData = new byte[4   fileNameByte.Length   fileData.Length];
                    byte[] fileNameLen = BitConverter.GetBytes(fileNameByte.Length);

                    fileNameLen.CopyTo(clientData, 0);
                    fileNameByte.CopyTo(clientData, 4);
                    fileData.CopyTo(clientData, 4   fileNameByte.Length);

                    curMsg = "连接服务器中 ...";
                    clientSock.Connect(ipEnd);

                    curMsg = "文件发送中";
                    clientSock.Send(clientData);

                    curMsg = "断开中...";
                    clientSock.Close();
                    curMsg = "文件已传输.";

                }
                catch (Exception ex)
                {
                    if (ex.Message == "不能连接,因为目标机器积极地拒绝它")
                        curMsg = "文件传输失败. 因为服务器未连接.";
                    else
                        curMsg = "文件传输失败"   ex.Message;
                }

            }
        }

        private void label4_Click(object sender, EventArgs e)
        {
            label4.Text = tcp4.curMsg;
        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void label3_Click(object sender, EventArgs e)
        {
            label3.Text = tcp4.curMsg;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            label3.Text = tcp4.curMsg;
        }

    }
}